Telegraph-transmitter



C. W. LEISER. TELEGRAPH TRANSMITTER.

APPLICATION FILED JAN. 29,, 1909.

Patented June 22,1909.

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Summon THE NORRIS PETERS cu, vusmuamn, B4 c G. W. LEISER. TELEGRAPH TRANSMITTER. APPLICATION FILED JAN. 29, 1909.

Patented June 22, 1909.

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attorney ms NORRIS PETERS ca, wAsnmcwu. n. c,

i and operation of apparatus of the character CHARLES WILSON LEISER, OF SALT LAKE CITY, UTAH.

TE LE GRAPH-TRANSMIT TEE.

Specification of Letters Patent.

Patented June 22, 1909.

Application filed. January 29, 1909. Serial No. 474,921.

To all whom it may concern:

Be it known that 1, CHARLES WiLsoN LEISER, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented new and useful Improvements in Telegraph- Transmitters, of Which the following is a specification.

This invention relates to telegraph transmitters of that type wherein separate keys are employed, one for operating the line circuit direct for making the dashes, and the other for operating the local circuit which includes an electro-magnet that controls secondary contacts for opening and closing the line circuit to produce the dots, the local circuit being automatically opened to deenergize the electro-magnet v-Jhen the secondary contacts are engaged, so that the line circuit will be momentarily closed with each movement of the armature of the electro-magnet.

More specifically, the invention relates to improvements in telegraph transmitters such as are disclosed in the United States Letters Patent Numbers 837,413 and 853,556, which have been granted to me.

One of the objects of my present invention is to improve and simplify the construction referred to so as to be comparatively simple and inexpensive to manufacture, reliable and efficient in use and readily and conveniently manipulated.

Another object of the invention is to rearrange and lessen the number of operating parts so as to obtain a better co-action, materially lessen the friction, improve the operation of the magnet so as to provide a stronger pull on the armature, and require less operating current.

A further object is the employment of a novel dampening or deadening device for the armature so as to effectively prevent rebounding of the latter as the same returns to normal position upon the deenergizing of the electro-magnet to thereby insure reliable and efficient operation.

With these objects in view and others, as will appear as the description proceeds, the invention comprises the various novel features of construction and arrangement of parts which will be more fully described hereinafter and set forth with particularity in the claims appended hereto.

In the accompanying drawings, which illustrate one of the embodiments of the invention, Figure 1 is a plan view of the transmitter. Fig. 2 is a sectional view taken on the line 2-2,Fig. 8. Fig. 3 is a side view of the transmitter. Fig. 4 is a perspective view of the deadening or dampening device for the armature. Fig. 5 is a detail sectional view of the adjustable support for one of the secondary contacts. Fig. 6 is a diagrammatic view of the circuit connections.

Similar reference characters are employed to designate corresponding parts throughout the views.

Referring to the drawing, 1 designates the base-plate of the transmitter which is adapted to be secured to an ordinary operating table, and on this base-plate the various parts of the transmitter are mounted. The electro magnet A. is provided with two spools or windings 2 arranged on vertical cores 3 that have their lower ends secured to a yoke piece 4-. that is fastened to the base plate 1. Arranged between the spools of the electro-magnet is a vertically-disposed rock shaft 5 that has its lower end journaled in the yoke 4 and its upper end journaled in a bracket 6 secured to the base-plate 1 at one side of the electro-magnet, the said shaft being pivoted in bearings '7, one of which is shown in Fig. 3, and these bearings are adjustable relatively to each other so that the shaft can be very sensitive in movement. Secured to the rock-shaft 5 and arranged in cooperative relation with the polar extremities of the cores is an oscillatory armature 8. On the bracket 6 is a laterally-projecting arm 9 which constitutes a stop with which one extremity of the arm engages when the same is in unattracted or normal position. The armature is attracted by the electromagnct against the tension of a helical extension. spring 10 that has one end fastened to the armature at 11 adjacent the axis of oscillation and the other end attached to an adjusting screw 12 mounted in a supporting block 13 of insulating fiber or the like, and by turning the screw, the tension of the spring can be accurately adjusted. Carried by the armature is a deadening or dampening device designated. generally by B which operates to prevent rebounding when the armature returns to normal position upon the deenergizing of the electro magnet.

This device comprises a weight 14 that has L-shaped arms 15, as shown in Fig. 4, to embrace the end of the armature opposite from that which strikes the stop 9. This weight is formed with an arm 16 that is disposed over the top of the armature and has its inner end connected with the armature by a pivot 17 adjacent the axis of oscillation. The embracing arms 15 are spaced apart a distance greater than the width of the armature so that the latter can move independently of the weight with the result that during the rebound movement of the armature the momentum of the latter will be opposed to the momentum of the weight and thus neutralize each other and consequently minimize the tendency to rebound.

The movement of the armature causes the making and breaking of the line circuit for transmitting the dots through the medium of the secondary contacts 18 and 19. The contact 18 is arranged on the free extremity of the spring 20 that is rigidly secured to a collar 21 on the shaft 5, and the contact 19 is arranged on a spring 22 carried by a pivot post or support 23 mounted on the baseplate 1. at one side of the block 13. As shown in Fig. 5, the pivot post 23 is secured in place by a screw 24 on which the post can be adjusted to change the position of the contact 19 so that the period of duration of engagement of the contacts 18 and 19 can be nicely adjusted, there being an arm 25 on the 0st 23 for facilitating the adjusting of the atter. Normally, the contacts 18 and 19 are separated as shown in Fig. 1, and when the electro-magnet actuates the armature the contacts are brought together as shown in Fig. 2 to thereby close the line circuit to transmit the dots. The circuit of the electro magnet is adapted to be automatically opened by a circuit breaker C so as to permit the contacts 18 and 19 to separate after a dot has been transmitted. This circuit breaker comprises a platinum-tipped screw or contact 26 mounted in a post 27 at the rear of the bracket 6 and disposed in cooperative relation with a spring contact 28 that has its front end secured to the block 13 and extending reari\"ardly therefrom across the shaft 5. On the shaft 5 is a finger 29 of fiber or other insulation which constitutes a cam for engaging the spring member 28 to move the same out of contact with the screw 26 to open the local circuit in which the electro-magnet is included. The cam 29 is so arranged that the circuit breaker C will open the circuit of the electro-magnet before the armature 8 will be directly over the pole pieces or assume a dead center, so that the armature can quickly return to off position when the circuit is broken.

The transmitter is provided with separate dash and dot keys D and E which are disposed at opposite sides of the block 13 and secured by leaf springs 30 and 31 which are attached to the inner ends of the keys by rivets 32 and to the inner end of the block 13 by fastening screws 33, the screws 33 at one side of the block serving to secure the spring member 28 of the circuit breaker in position. The outward movement of each key is limited by the screw 34 that passes freely through an opening 35 and screws into the supporting block 13. On the keys are contact points 36 and 37, respectively, which cooperate with fixed contact points 38 and 39 on the metal pieces 40 and 41, respectively, that are connected by suitable Wires under the base-plate with the circuits. By adjusting the screws 34, the gaps between the contact points 36, 38 and 37, 39, can be varied.

Referring to Fig. 6, it will be observed that the electro-magnet A is included in a local circuit that contains a batteryb and when the key E is pressed, current will flow from the battery through the wire 41, windings of the electro magnet, wire 42, contacts 39 and 37,

key E, spring member 28 of the circuit breaker, screw 26, and wire 43. If desired, binding posts 44 and 45 maybe arranged on the base-plate, as shown in Figs. 1 and 2, for connecting the battery with the transmitter. The flow of current caused by the closing of the key E energizes the electro-magnet so that the contacts 18 and 19 are brought together to complete the line circuit whereby current will flow through the wire 46, pivot post 23, spring member 22, contacts 18 and 19, spring member 20, shaft 5, and line wire 47. The line wires 46 and 47 are connected with the transmitter by binding posts 43 and 49. The movement of the armature causes the cam 29 to disengage the spring member 28 from the screw 26 so that the battery circuit will be open after an impulse has been sent through the line by the closing of the circuit through the secondary contacts 18 and 19. The armature immediately recovers and the circuit breaker C will again close the circuit in case the operator maintains a pressure on the key E, and as long as the key is held closed, there will be a repetition of dot impulses sent over the line. When the key D is manipulated for sending dash impulses, the current flows through the wire 46, pivot post 23, wire 50, key D, contacts 36 and 38, and wire 47.

From the foregoing description, taken in connection with, the accompanying drawing, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains, and while I have described the principle of operation of the invention, together with the apparatus which I nowconsider to be the best embodiment thereof, I desire to have it understood that the apparatus shown is merely illustrative,

and that such changes may be made when magnet, and a line circuit in which the said desired as are Within the scope of the claims appended hereto.

Having thus described the invention, what I claim is 1. The combination of an electro magnet, an oscillatory armature arranged with its axis between the windings of the electromagnet, a spring for biasing'the armature, a circuit-closing means operated. by the armature, a stop for the armature, and means preventing rebounding of the armature from the stop.

2. The combination of an electro-magnet, an oscillatory armature therefor, means for biasing the armature away from the pole pieces of the electronnagnet, a stop for the armature, and a device mounted wholly on the armature for preventing rebounding thereof upon striking the stop.

3. The combination of an electro1nagnet, a movable armature therefor, means for biasing the armature in a direction away from the pole pieces of the electro-magnet, a stop with which the armature normally engages, and a weight movably mounted on the armature for preventing rebounding of the latter upon striking the stop.

4. In a telegraph transmitter, the combination of an electro-magnet, an armature, a spring for opposing the movement of the armature under the attractive force of the electro-magnet, and means mounted on the armature for quickly bringing the latter to rest when the electro-magnet is deenergized.

5. In a telegraph transmitter, the combination of an electro-magnet having spaced spools, a shaft disposed between. the spools, an armature carried by the shaft to oscillate on the same as an axis, a spring connected with the armature, a stop with which the armature is held in engagement by the spring, and a movable weight mounted on the armature and located at one side of the said shaft to deaden the rebound of the armature when the same strikes the stop.

6. The combination of a rock shaft, an armature thereon, an electro-magnet for the armature, a spring contact-carrying member mounted on the shaft, an adjustable contact member with which the other member is adapted to engage, a circuit breaker included in circuit with the electromagnet, means on the shaft for opening the circuit breaker, a key for controlling the circuit of the electroi l l members are included.

7. The combination of an electro-magnet having verticallydisposed spools, a vertically-disposed shaft, means for supporting the shaft, an armature on the shaft to oscillate therewith, secondary contact members for controlling a line circuit, a circuit breaker adapted to be connected in circuit with the electromagnet, and a cam on the shaft arranged to open the circuit breaker.

S. The combination of an armature-actuated shaft, secondary contacts engaged and disengaged by the movement of the shaft, a circuit breaker including a yielding member disposed adjacent the shaft, and a cam on the shaft for opening the circuit breaker by engagement with the said yielding member.

9. The combination of a base-plate, a supporting block of insulation mounted thereon, dot and dash keys mounted on the supporting block, an electro-magnet mounted on the base-plate, an oscillatory armature, a spring connected with the armature, an adjustable screw mounted on the block and connected with the spring for varying the tension thereof, secondary contacts engaged and disengaged by the movement of the armature, a line circuit controlled by the said contact, a circuit breaker for opening the circuit of the electro-magnet, and means moving with the armature for opening the circuit breaker after the secondary contacts are engaged.

10. The combination of a base-plate, a supporting block of insulation mounted thereon, dot and dash keys mounted on the supporting block, an electro-magnet mounted on the base-plate and having spaced. windings, a shaft mounted between the windings, a support for the shaft, an armature mounted on the shaft, secondary contacts engaged and disengaged. by the movement of the shaft, a circuit breaker including a spring member secured to the said supporting block and extending across the shaft, and a cam on the shaft for engaging the spring member to open the circuit breaker to open the latter after the secondary contacts are engaged.

In testimony whereof I ELHIX my signature in presence of two witnesses.

CHARLES WILSON LEISER.

Witnesses:

A. J. WEBER, O. L. OLSON. 

